C

Caming ? Grooved usually h-shaped, rod of cast lead used, as in stained glass, to hold the panes or pieces of glass together.

Cam Lock and Keeper - Mechanisms that pull the sash together when placed in the locked position.

Casement Window - A window with a side-hinged sash that opens outward for ventilation.

Casing ? Exposed molding or framing around a window or door, on either the inside or outside, to cover the space between the window frame or jamb and the wall. (See Trim)

Caulk ? To seal cracks and joints around window and doorframes to prevent leakage of water and air.

Caulking ? A mastic compound for filling joints and sealing cracks to prevent leakage of water and air; commonly made of silicone, bituminous, acrylic, or rubber based material.

Circle Top Window ? A window having a curved top and a flat bottom. The shape of the window is an exact half-circle with the height being exact one-half of the width. Also called circle head, half-circle and half round. (Also Circle Top Transom)

Combination Storm Sash & Screen ? A frame assembly of stiles and rails containing a half screen and two glass storm panels; in summer the bottom storm panel is stored in the top of the combination frame and replaced by the screen panel; sometimes called "combination storm sash and screen unit" or simply "combination window unit." (Not recommended for vinyl windows)

Conduction - Energy transfer from one material to another by direct contact.

Convection - Heat transfer by currents that flow from a warm surface to a colder one.  

Cottage-Style Window ? Hung Window (Single or Double) that has larger bottom sash (lite) than the top sash (lite). (See Oriel)